Tell the world that you just learned a nifty shortcut for dividing by 5 in your head.

- Video Course
- Video Course Overview
- General GRE Info and Strategies - 7 videos (free)
- Quantitative Comparison - 7 videos (free)
- Arithmetic - 42 videos
- Powers and Roots - 43 videos
- Algebra and Equation Solving - 78 videos
- Word Problems - 54 videos
- Geometry - 48 videos
- Integer Properties - 34 videos
- Statistics - 28 videos
- Counting - 27 videos
- Probability - 25 videos
- Data Interpretation - 24 videos
- Analytical Writing - 9 videos (free)
- Sentence Equivalence - 39 videos (free)
- Text Completion - 51 videos
- Reading Comprehension - 16 videos

- Study Guide
- Your Instructor
- Office Hours
- Extras
- Prices

## Comment on

d percent of d## Do you have to use the p

## No, that formula (Part/Whole

No, that formula (Part/Whole = Percent/100) only works when we aren't trying to find some percent OF some value.

## Thanks so much!

## great!

## Great explanation! Now if the

## That's correct. If bcd = 4000

That's correct. If bcd = 4000, then we'd get 4000/10,000, which simplifies to 2/5

## I worked this out in a

b=10

c=50

d=5.

bcd=(10)(50)(5)=2500

10% of 50 = 5.

5% of 5 = 2.5

This gives me the fraction: 5/2.

Is this incorrect? Thanks!

## Almost!

Almost!

Your solution is perfect until you got to "5% of 5 = 2.5"

You're correct to say that 10% of 50 = 5

From this, we can also say that 5% of 50 = 2.5

However, we cannot say that 5% of 5 = 2.5

Instead, let's think of it this way:

10% of 5 = 0.5

So, 5% of 5 = 0.25 = 1/4 (the correct answer)

Cheers,

Brent

## Ha! Of course. Thank you for

## Hi Brent,

If I leave the answer as 1/4 in the exam, would that be a problem?

## A response of 1/4 would be

A response of 1/4 would be perfect.

In fact, any fraction that equals 1/4 (e.g., 2/8, 25/100, 5/20, etc) would be considered correct.

For more on this, start watching the following video at 3:59: https://www.greenlighttestprep.com/module/general-gre-info-and-strategie...

Cheers,

Brent

## Simply say b*c*d =2500 and b

=> b/100 * c =d => bc = 100*d--> step 1

=> substitute step 1 in given equation bcd=2500 as 100*d*d=25

=> d power 2 = 25 => d=|5|

=> now d%d means d/100 * d => 5/100*5 = 1/4

## Nice work!

Nice work!

## what's s percent of r of 200

## Does r represent a fraction

Does r represent a fraction (as in "What is s percent of 3/4 of 200?")

Or does r represent a percent (as in "What is s percent of 13 percent of 200?")

I'll answer both questions.

r represents a fraction: What is s percent of r of 200?

s percent of r of 200 = s/100 of (r of 200)

= s/100 of (200r)

= (s/100)(200r)

= 200sr/100

= sr

r represent a percent : What is s percent of r percent of 200?

s percent of r percent of 200 = s/100 of (r/100 of 200)

= s/100 of (r/100)(200)

= s/100 of (200r/100)

= s/100 of (2r)

= (s/100)(2r)

= 2sr/100

= sr/50

Aside: I could have used fewer steps, but played it safe :-)

## Add a comment